I need to check pub.cash, but it seems like they are focused on providing you with a lightning address where people can mint you ecash.
That you can then redeem when back online on your profile, so using ecash as a buffer to get lightning zap on nostr.

Cashu opens a ton of possibility, one I am excited about is nip-61, zap notes from your nostr profile with ecash. Checkout nutsack 

 Would love to see this. Is nuts.cash using NIP-60? 

 No I don’t, 

Really just sending incoming cashu, be it mint or return change to my own DM

Everything outgoing is in shared DM

The rest of the proofs state is taken care by the mints themselves, claim/spent 

Will def support nip-61